Metal weather-strip.



Jf 0. M oMAHON.

METAL WEATHER STRIP. APPLICATION FILED FEB. 24, 1909.

1 526, Patented May 9,}1911.

awocml'o'z wi/f weowor tinrrm) STATES PATENT OFFICE.

JOSIAH C. McMAI-ION, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO CHAD/[BERLIN METAL WEATHER STRIP COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF IVIIGHIGAN.

not .526.

METAL WEATHER-STRIR Application filed February 24, lane se1'ia1No. 479,804.

To all whom it may concern:

lie it known that l, Josnur C. MGMAHON, a citizen of theiUnited States, residing at .littsburg, in the county of Allegheny and btate of Pennsylvania,have invented certain new and useful Improvements in Metal lVeather-Strips, of which the following is a specification, reference being had therein to the accompanying drawing;

This invention relates to an improvement in metal weather strips and it is embodied in the construction presently to be described and defined in the claims.

lleretofore. in the art of metal weather strips it has been customary usually to construct the strip of thin strips of zinc and to bend the zinc or metal longitudinally upon itself to form at raising rib thejlatter enterin g in the groove formed in the sliding sash. In such constructions and in fact in metal weather strips of the generalrib or tongue and groove type it would be necessary to form the base flange flat so as to preserve as far as possible the relative position of the walls of the sash groove and the rib of the strip. it often and in fact usually occurs that in window structures more particularly of the sliding sash type there is required considerable space between the edges of the sash. and the bottom of the run way of the groove so that the sash if swollen by (lampness will not stick or bind beyond the point of immovabilit-y. lt is often found in window structures that the space between the sash and bottom of the guide way is very considerable and that the window has or permitted a wide movement from left to right this has necessitated in the application of metal weather strips the placing of battens or small lilling strips of wood or other material in the bottom of the groove so as to build them up properly and thereby reduce the amount of movement permitted .the sash. It has beenrecoguized that were it possible to provide a metal weather strip which would norn'ially hold the window sash against edgewise movement as well as against transversemovement or rattling without undue binding or wedging of parts together it would be very desirable and overcome existing objections. It is the provision of a strip for acquiring this result and for avoidin the use of battens that the present invention is intended.

In the. drawings is shown an embodiment of the invention but it is to-be understood.

that modifications and changes can be made without departing from the nature and principle of the invention.

Figure l is a cross section of a window frame and sash rail showing the invention, Fig. 2 is a sectional view of the metal weather strip, Fig. 3 is a perspective view of a section of metal weather strip embodying the invention, Fig. 4t is a view similar to big. 1 showing the position of the parts when the sash frame more closely tits the run way.

A designates a window frame of the usual construction having the molding B and the. parting beador strip (l forming 'lhcrebetween the usual run way or guide at the side of the window frame. The molding l) is undercut along the base of its inneredge as at D the undercut extending well toward the center of the molding although in this particular the term center is employed arbitra rily and relates to the construction shown.

E designates one of the stiles of a sliding sash having adjacent one of its edges or between the edge and its center a groove 6.

Fdesignates the metal weather strip which. is conveniently of a width to extend entirely 'across the run way of the window frame and project beyond the same. This strip is formed of a thin sheet having more or less resiliency such as is possessed by sheet zinc now commonly used for in "tal. weather strips. The strip .is provided with a flat base G- an outstanding rib part 11 formed of the metal bent upon itself as is usual in this type of metal weather strip. The opposite flange K of the strip is ribless and is bowed or bent outward from the edge of the rib H the bow or bend being gradual and of considerable arch so as to carry the crown of the bend outward normally to a point adjacentthe plan of the center of the rib ll as shown in Fig. 1. The use of the term ribless in connection with the flange K is intended to indicate that such llange is not provided with any ribs or other projections which engage the window sash so that the free edge of said flange is at all.- times free to move laterally when the flangeis subjected to pressure. flange K is bentinward and the edge thereof is projected substantially straight or parallel with the position of the securing flange G. It will be observed that the securing flange is relatively narrow while-the spring or bowed flange is of considerable width. In applying this strip the edge of the securing The outer portionof the base edge 70 without engaging the rear wall of the undercut or groove, a suflicient distance ,to pernrit'the full compression of the bowed curved part of the flexible or sprin rib the spring flanges.

K, as shown in Fig. 4 of the drawing, t ereby permitting the sash member to expand or move slightly without binding or wedging 15 the sash in therun way.-

By the above described construction it.

will be observed that the compressing movement of the spring fiangedoes not disturb the position of the rib H in the groove in the window sash and that by completely straightening out the spring flange the rib will not be shifted laterally owing to its position and owing to the curvature of the spring flange. In use the spring flange is sufficiently bowed and positioned to normally engage with the edge of the sash and so on both sides of the window so that the sash is prevented from moving edgewise unless considerable pressure is employed to overcome the pressure of the spring K. will also be observed that the strip is so made that it will automatically adjust itself to the spacing between the sash and the bottom of the runway and will permit as above stated the free swelling of the sash without causing a binding action. This spring contact also serves as an auxiliary barrier to prevent the ingress of air, dirt, etc.

It is obvious that in applying the strip it can be reversed so that the edge or securing flange will be adjacent the molding and the undercut portion formed in the parting bead as is well understood in this art.

I am of course aware that metal weather strips have heretofore been constructed of spring metal having thereon projecting parts entering a groove but insuch construction there-has alwaysbeena variation in the position ofthe projecting part relative to the walls of the groove as the strip is depressed into the runway. I am also aware that it has been heretofore suggested to form a metal weather strip of bowed members or: flanges without the groove entering the part or member. By the formation of strip thus described the use of battens is avoided .to a very large extent the unnecessary space between the sash and frame being occupied by Having thus described the invention what is claimed as new and desired to be secured by Letters' liatent is: V

1. A metal weather strip formed from asingle piece of sheet metal and comprising a seahng rib adapted for engagement w1th a cooperating grooved member, a flat attaching flange projecting from one side of the 1 base of said rib, and a relatively wide, gradually arched spring flange projecting from the opposite side of the base of the Nb.

2. A metal weather strip formed from a single piece of sheet metal and comprising a sealing rib adapted for engagement with a coiiperating grooved member, a flat attaching flange projecting from one side of the base of the sealing rib, a relatively wide gradually arched spring flange pro ecting I outwardly from the opposite side of the base of the sealing rib and having its free edge returned to the plane of the attaching flange of the strip.

3. Thecombination with a window frame having a runway formed with a groove leading from the side thereof and a sliding sash having a rib receiving groove, of a metal weather strip having at one edge an attaching flange secured at one'side of the center of the run way, an outwardly extending rib entering the groove of the sash and the outwardly bowed yielding flange extending from the rib and having its free edge bent rearwardly and extending-into said groove of the runway, the free edge of said flange being free to move laterally when pressure is applied to the bowed portion thereof.

4. The combination with a window frame and a sliding sash of a'metal weather strip interposed between the sameconsisting of an attaching flange, a rib cxtendlng outwardly from the edge of the flange and an.

adapted to engage a groove in the other of said members, said. strip beingprovided ,with an arched spring flange extending from the base of the rib and pro ectlng outwardly therefrom, the free edge of said flange resting upon the supporting member for the strip and being free to move laterally thereon.

In testimony whereof I aflix my signature in presence of two witnesses.

JosIAu o tMAuoN. .Wit neses:

J. Esnnr, I .WILLmM JONES, Jn, 

